وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَعْرِبُوا الْقُرْآنَ وَاتَّبِعُوا غَرَائِبَهُ وَغَرَائِبُهُ فَرَائِضُهُ وَحُدُودُهُ» . رَوَاهُ الْبَيْهَقِيّ فِي شعب الْإِيمَان

Ibn ‘Umar reported God’s messenger as saying, “These hearts be­come rusty just as iron does when water gets to it.” On being asked what could clear them he replied, “A great amount of remembrance of death and recitation of the Qur’ān.” Transmitted by Baihaqī in Shu'ab al-īmān.